The plugin for those people how want to feel confident in your code.
If something goes wrong you are the first to be notified about it.
The email not only contains an error message but a bunch of useful information.
It takes control over the system and catches every error: exceptions, fatal errors, notices, memory limit error, php parse errors and so on.
It easy to customize because the plugin was made as a set of components: message, driver, handler, decorator.